This practice specifies a color bar pattern compatible with both high- and standard-definition environments. The multi-format color bar signal is originated as an HDTV signal with an aspect ratio of 16:9 and may be down converted to an SDTV color bar signal with an aspect ratio of either 4:3 or 16:9.
More SMPTE standard pdf
SMPTE 352-2010
Television - Video Payload Identification for Digital Television Interfaces
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SMPTE 379-2-2010
Television - Material Exchange Format (MXF) - MXF Constrained Generic Container
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